U007A

Control Module Communication Bus H Off

Severity

🔴 High

Can you drive?

Do not drive — repair immediately

Approx. repair cost

$6–56 (est.)

Symptoms

Check Engine Light Is On
Disabling individual vehicle systems
Incorrect instrument readings
Problems starting the engine
Errors in other systems

Causes

Open or short circuit in CAN bus wiring
Poor contact in connectors
Malfunction of one of the control modules
Problems with module power supply
Damage to CAN bus terminators

How to Fix

Check the integrity of the CAN bus wiring
Inspect and clean all connectors
Check power supply and grounding of modules
Disable the modules one by one to find the faulty one.
Check the resistance of the CAN bus terminators

Related codes

U0001 U0121 U0140